How the output will be equals to 28?

Question

#include <iostream>

using namespace std;

int main() {
int x=034;

cout<<x;
}

Answer 1

When a variable is assigned a value there are several symbols to be used to define the base of the number. e.g:

int x = 034 // <- zero lead number meaning octal (base 8)
int x = 0x20 // <- zero and x meaning hexadecimal (base 16)

Hth, cmiiw.